(2357) Phereclos
This object has a more recent orbit available here
Object
| Object | (2357) Phereclos |
| Diameter(1) | 95 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 8.94 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458200.5 |
| Semi major axis | 5.209937 ± 0.000000 au |
| Eccentricity | 0.044987407 ± 0.000000048 |
| Inclination | 2.668919484 ± 0.000004754 ° |
| Longitude of ascending node | 179.249176 ± 0.000095 ° |
| Argument of perihelia | 74.174431 ± 0.000132 ° |
| Mean anomaly | 279.813676 ± 0.000103 ° |
| Orbital period | 11.89 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 2357_Phereclos_nima_v1.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2019-01-29 |
| Number of observations used in the fit | 2332 |
| Number of rejected observations | 16 |
| Number of DES observations | 0 |
| Number of MPC observations | 2348 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.608 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.020 | 0.016 |
| 2018-07 | 0.018 | 0.014 |
| 2019-01 | 0.024 | 0.017 |
| 2019-07 | 0.026 | 0.019 |
| 2020-01 | 0.029 | 0.017 |
| 2020-07 | 0.040 | 0.023 |
| 2021-01 | 0.033 | 0.016 |
| 2021-07 | 0.051 | 0.022 |
| 2022-01 | 0.035 | 0.014 |
Ephemeris comparison
Difference between NIMAv1 and JPL47 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.